Concrete form



June 13, 1933. J s MILLER 1,914,033

CONCRETE FORM' Filed Nov. 9, 1931 2 Sheets-Sheet l pm. 1 1 l I 1 UI U 1 l I I 1 I I o! o; 1

M I I I I 0I o,

INVENTOR June 13, 1933. J- 5, MULLER 11,914,033

CONCRETE FORM Filed Nov. 9. 1951 2 Sheet-s-Sheet 2 Patented .lune 13, 1933 unirsi) STATES 1PA-reiner Price-3* .rAMEs s. MILLER, 0E PITTSBURGH, PENNSYIANIA AssIGNoE To THEDRAvo coN- TRACTING COMPANY, A CORPORATIQN 0E. PENNSYLVANIA y CONCRETE 'EoEM This invention relates to anarc-li lform for concrete Work.` A @ne objectof the invention 1s to provide an arch formin' Which a plate of relatively:l

light mate-rial, constituting the spanfol the form, is so reinforced as to provide 'a' form of relatively great strength.

Another object ofthe invention is to provide means for regulating the span of the form to the position of the memberson whichl it is to be supported.

Another object of the invention is to-provide simple and effective means for supporting the arch form and the load carried thereby in suspended position, and'which provide;

for rapid and easy mounting and demountin'g of the form. l l

a plan viewy of the arch form; Figure II is a vertical section through the form'on the linel ly light metallic plate 1, which is bent to the desired radius to serve as a form for an arch or a tunnel roof. Along each side edge of the plate are angles 2 having their lateral flanges Qa riveted to the plate 1, and their depending flanges inset very slightly from the extreme edge of the plate. `The depending flange Q?) of each of these angles is provided with a plurality of bolt holes 2c by means of which adjacent forms may be interconnected to provide a tunnel roof structure. These edge angles 2 serve to stillen the form structure as Well as constituting interconnecting means for adjacent forms.

At opposite end regions of the plate are spaced and aligned pairs of angles 3, having their lateral flanges 3a underlying and riveted to the plate, and their depending flanges 3b mutually spaced to form a channel. Between opposed pairs of flanges a turnbuckle structure lies, having its solid members bolted between the opposed pairs of depending flanges 3b and its clevis 5 engaging the i edge n'glesl 2 are In the accompanying drawings Figure I is threaded ends 6 of the member-s4. It 'will be noted that the angles 3 are of "relatively great longitudinalextent, so that theygserve as s tiflfeningmeans for the plate,t.as`welllras providing., L connection for the trnbu'cklel As ,shown in .Fi ure I, two pairsy lofangles 3 aremou'nted adjacent each end of the plate, butthis number may4 ob-viously be reduced or increased in accordance with the widthl ofthe platel constituting the span of the form. 4 This pan'is adjusted to change its radius, o rv'to adjust ittoYV supporting means at the end v edges of'tlie fornpigby means of the turnbucklesV which may betaken up' to flex the. plate', 1'to a greateror lesser extent.v To facilitatejthis adjustment, the flanges 2b lof the j' j provlded with a plurality of transverseslotsfd. The meansfor' supportin'gthe, form are simple and eflicient. Intermediate each pair yof angles 3 plate l 'is cut away to provide an contact beams'9'serving as mounting means for the form. An `les 3 are continued beyond the end edges of t e plate, and rest in members supported from the beams 9.

The supporting means proper comprise hooks 10, adapted to be extended through slots 7 and to engage the upper faces of beams 9. Each of the hooks 10 has a threaded shank 11, which is surrounded by a perforated trough-shaped plate 12. Plate 12 in the assembly rests on a nut 13 carried by the threaded shank 11 of the hook.

In mounting the form, the curvature of plate 1, and consequently the span of the form, is adjusted to the positioning of beams 9 by means of the turnbuckles. Feet 8 along the end edges of the plate l are inserted beneathbeams9, and hooks 10 are inserted through the slots 7 With the ends of flanges 3 resting in plates l2. When hooks 10 are caused to engage the upper surface of the beams 9, the beams are thus embraced between the hooks and the feet 8 along the end edges of plate 1 to firmly engage the form in supported position.

In demounting the forni, after it has been used for a concrete arch or roof, the nut 13 on hook shank l1 is loosened. The hook proper l0, being free, may then readily be loosened in the concrete, and withdrawn through the slot 7. The form support is demounted, as Well as mounted, by simple manipulation of the supporting hooks.

It will be noted that the form is simple, dispensing with complicated means for adjusting, positioning, and supporting it. It is of sufficient flexibility to permit adjustment, while being so reinforced as to provide suflicient stiffness for the load of concrete carried by it. N o special means or members exterior to the form are required for mountingv it in position for use.

. I claim as my invention:

'1.) An arch or roof form for concrete work comprising a tbody plate', angle members spaced in mutual alignment on opposite sides ofthe transverse center line of the plate and attached to the under face thereof to provide aligned depending flanges, a turnbuckle structure attached to mutually aligned flanges to act on the plate for adjusting the curvature thereof, said plate slotted in the region of said angle members and adjacent the endedges of the plate, said angles continued onwardly beyond the end edges of the plate, free supporting hooks extending upwardly through the slots of the plate, and members on said hooks underlying the plate contacting the said angle members and carrying the plate.

2. An arch or roof form for concrete work comprising a body plate, angle members spaced in mutual alignment on opposite sides of the transverse center line of the plate and attached to the under side thereof to provide depending flanges, a turnbuckle structure attached to mutually aligned flanges to act on the plate for adjusting the curvature thereof, said plate slotted in the region of said angle members and adjacent the end edges of the plate, free supporting hooks extending upwardly through the slots of the plate, members on said hooks underlying the plate contacting the said angle members and carrying the plate, and feet co-operative with said hooks formed by bending the plate along lines parallel to its end edges.

3. An arch or roof form for concrete work comprising a body plate, free supporting hooks adjacent the end edges of the plate and extending upwardly therebeyond, and supporting members mounted directly on said hooks underlying the end edges of the body plate and providing a supporting cradle for the body plate.

4l. An arch or roof form for concrete work comp-rising a body plate, free supporting hooks adjacent the end edges of the plate and extending upwardly therebeyond, supporting members mounted directly-on said hooks underlying the end edges of the body plate 5. An arch or roof form for concrete work comprising a body plate, free supporting hooks adjacent the end edges of the plate and extending upwardly therebeyond, frame members attached to the under side of said plate in the region ofsaid hooks, and supporting membersmounted directly on said hooks underlying the plate for contacting said frame members and providing a supporting cradle for the' plate.

6. An arch or roof form for. concrete work comprising a body plate, free supporting hooks adjacent the end edges of the plate and extending upwardly therebeyond, frame members attached to thelunderfside of said plate in the region of said hooks and extending onwardly beyond the body plate, supporting members mounted' directly on said hooks underlyingthe plate contacting the said frame members and providing a supp'orting'cradle for the plate, and feet co-operative with said hooks formed by bending the plate along 'lines parallel to its end edges.

7. An arch or roof form for `concrete work comprising a single flexible body plate, de-

pending fianges extending along the side L' edges of the plate and slotted upwardly from their lower edges for increasing the load carrying capacity ofthe plate whilev permitting flexing adjustment of the arch formed by the plate, and means attached to the under face ofthe plate for exerting a flexing force on the plate.

8. An arch or roofform for concrete work comprising a single flexible body plate, depending flanges extending along the side edges of the plate and slotted upwardly from their lower edges for increasing the load carrying capacity of the plate while permitting flexing adjustment of the arch formed by the plate, angle members spaced in alignment with each other on opposite sides of the transverse center line of the plate and attached to the under face thereof to provide aligned depending flanges, and a turnbuckle structure attached to the aligned flanges to act on the plate for adjusting the curvature thereof.

In testimony whereof I have hereunto set my hand.

JAMES S. MILLER.

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